In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

She said there were flames and burns to her niece's lap and scorch marks in the car before the battery jumped out the phone and landed at her feet.

"I was trying to stamp out the fire while she was screaming, I pulled over, got out of the car and made sure she was alright. She was pretty hysterical."

After pulling over to attend to Brooklyn and calm her frightened 18-month-old son sitting in the middle seat at the rear of her car, Mrs Handley drove to a local medical centre where her niece was treated.

She was treated for second and first degree burns to her thigh and stayed off school. Mrs Handley said the explosion burnt through her school uniform.

Brooklyn had headphones plugged to the phone thought it was not playing any music, Mrs Handley explained.

"Luckily she wasn't holding it to her face, it was just her thighs."

Mrs Handley said the Brooklyn's father owned the phone, and the battery was purchased off an internet shopping site three months ago.

Last year Samsung scrapped its much-hyped Note 7 smartphone after reports of devices igniting.